The large platform (3/8"thick x 7-3/8") is supplied with either a
PC collar guide cutter hole or standard 1-9/16".

Expect to do a little templet routing with this trimmer & its
round subbase. Note, the cutter hole is not in the center of the
casting; it is centered on my disk, however.

You'll have a hell of a time trying to tip this router over doing
edge work.

The PR-20 is a wonderful trimmer, well powered, light (3.3
lbs.), nicely designed and worthy of respect. Its elastomer motor
grip and handy electronics manage safety and control like no other
trimmer. The VS (16-35Krpm) and soft start are unnecessary for
small cutters, in my view, but sure to unnerve the competition.
My sample vibrates a little too much at 35K but smoothes out at
common trimmer speeds of ~ 25K.

A tool that is handled by its motor and casting should be free
of burr and sweet to the touch; few routers are. The
PR-20
is the first router I've ever handled that is completely
de-burred. The long wire set (10') has its strain relief exit
opposite the switch and view window of the casting, facilitating
control and cutter visibility. The depth adjustment is 2 stage,
and the motor travel is ~ 1.125". The use of the micro-adjust
requires a twist of the casting to engage, an annoyance for this
operator. The motor lock is a perfect, quick acting, over-center
lever.

Expect to rout ~ 1/4" x 1/4" across grain, a demanding
cut. However, this is a trimmer and as such, not designed to take
this much wood for sustained periods. Use it for light, shallow
trim and templet cuts. The self-release collet is the first in a
trimmer. The collet nut is tightened with a single-wrench (with
spindle lock); I use a 10mm wrench on the armature flats in lieu
of the lock. The motor rests well upside down for this. The
subbase end of the casting has been faced off but still rocks
slightly on my granite surface plate.

To get the utmost control of this trimmer use my subbase
accessories. You will not tip this router on tight turns or around
tortuous templet contours with my offset subbase. The over sized
(5") round plate provides more control for inside work and is
cutter centered, (to the diameter, ~ + or - .006"). My subbases
are supplied with either a 1-9/16" cutter hole or they are
machined for PC collar guides.

SUBBASES

In my view, trimmers are too small to navigate around a work
piece without tipping and spoiling the cut. An oversized round or
offset subbase is an essential for this operator. I make 4
subbases for the PR20. 2 to accommodate the PC/DW collar guide
system (round & offset). And 2 with 1-9/16" cutter holes. The
Round plates are 5.0" x ~6 & 9 mm x 360°. The collar accepting
plates are ~ 9 mm thick and center-able to ~ + or - .002"*. The
offset plates are 7-5/16" x 9 mm thick. All plates made of cast
Acrylic. All items include shipping & handling.
* Centricity depends on the collar flange diameter, best at 1.374"
- 1.375".